Respuesta :
Answer: Option (C) is the correct answer.
Explanation:
A molecule whose all the atoms lie in the same plane is known as a planar molecule. For example, benzene is a planar molecule.
A compound which have ring structure is known as aromatic compound like benzene is an aromatic compound.
Thus, we can conclude that out of the given options aromatic hydrocarbons differ from alkenes as aromatic hydrocarbons are flat, planar molecules, and alkenes are not.